#pragma once

#include <cstdint>
#include <string>
#include <vector>

#include <mw/crypto.hpp>
#include <mw/error.hpp>

#include "card.h"

/// Current pool weight and normalized probability for one card.
struct CardPoolEntry
{
    /// Eligible card.
    Card card;

    /// Weight scaled so the largest represented weight is one.
    double scaled_weight;

    /// Weight divided by the represented total.
    double probability;
};

/// Calculate and sample the current positive-rarity card pool.
class CardPoolService
{
public:
    /// Build probability entries in card-ID order.
    std::vector<CardPoolEntry> calculate(
        const std::vector<Card>& cards) const;

    /// Select one entry using eight cryptographically random bytes.
    mw::E<CardPoolEntry> select(
        const std::vector<CardPoolEntry>& entries,
        mw::CryptoInterface& crypto) const;
};

/// Format a represented pool probability for a card page.
std::string formatProbability(double probability);